mm: spinlock tree_lock

[linux-2.6-omap-h63xx.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index feb8448d8618795238a9cbbc5975f8950b2c5e23..2ed8b0389c51a91d7dbc24fa210310d3986ca5fe 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -109,7 +109,7 @@
 /*
  * Remove a page from the page cache and free it. Caller has to make
  * sure the page is locked and that nobody else uses it - or that usage
- * is safe.  The caller must hold a write_lock on the mapping's tree_lock.
+ * is safe.  The caller must hold the mapping's tree_lock.
  */
 void __remove_from_page_cache(struct page *page)
 {
@@ -141,9 +141,9 @@ void remove_from_page_cache(struct page *page)
 
        BUG_ON(!PageLocked(page));
 
-       write_lock_irq(&mapping->tree_lock);
+       spin_lock_irq(&mapping->tree_lock);
        __remove_from_page_cache(page);
-       write_unlock_irq(&mapping->tree_lock);
+       spin_unlock_irq(&mapping->tree_lock);
 }
 
 static int sync_page(void *word)
@@ -469,7 +469,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
                page->mapping = mapping;
                page->index = offset;
 
-               write_lock_irq(&mapping->tree_lock);
+               spin_lock_irq(&mapping->tree_lock);
                error = radix_tree_insert(&mapping->page_tree, offset, page);
                if (likely(!error)) {
                        mapping->nrpages++;
@@ -480,7 +480,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
                        page_cache_release(page);
                }
 
-               write_unlock_irq(&mapping->tree_lock);
+               spin_unlock_irq(&mapping->tree_lock);
                radix_tree_preload_end();
        } else
                mem_cgroup_uncharge_cache_page(page);